Sewing-machine.



No. 722,496 PATENTED MAR. 10, 1903.

G. H. DIMOND & W. F. DIAL.

SEWING MACHINE.

APPLICATION FILED MAY 14. 1901.

no MODEL. 3 SHBETSSHEET 1.

gpw

H" 27 J8 J9 Z0 WITNESSES. I JAILEI'NTORSF JM'MJW 27M A TTORNEY No. 722,496. PATENTED MAR. 10. 1903., G. H. DIMOND &: W. F. DIAL. SEWING MACHINE.

APPLICATION FILED MAY 14, 1901.

N0 MODEL. 3 SHEETS-SHEET 2.

z \HIIIIITI."

Al I l mmnunnm..

W/TNESSES g/N VE N 70/2;

, g .A M.

No. 722,496; I A PATENTED MAR. 10 1903.

G. H. DIMOND & W. F. DIAL. v

SEWING MACHINE.

. APPLICATION FILED my 14, 1901. No-xonEL. a sums-mum 3.

n 1 "III' 3'- l lli f WITNESSES q IN VE N 70/76 5 ATTORNEY 1m; "gums PETEDS ca. PNDTo-LITNQ, wgsnmomn o c LII UNITED STATES GEORGE-H. DIMOND AND WILBUR F. DIAL, OF BRIDGEPORT, CONNECTICUT,

ASSIGNORS TO WHEELER & WILSON MANUFACTURING COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

SEWING-MACHINE.

- SPECIFICATION forming part of Letters Patent No. 722,496, dated March 10, 1903.

Application filed May 14, 1901. Serial No. 60,177. (No model.)

To all whont it may concern.-

Be it known that we, GEORGE H. DIMOND and WILBUR F. DIAL, citizens of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Improvement in Stitch-Forming Mechanisms for Sewing-Machines, of which the following is a full, clear, and exact description.

Our invention relates to certainnew and useful improvements in sewing-machines of the lock-stitch variety and has especial reference to the means employed for restraining or controlling the movements of the threadholding or bobbin case during the passage of the upper thread around the latter.

The object of our invention is to effect an unobstructed passage for the loop of the upper thread in its travel around the threadholding case, in so far as said thread would meet with interference or resistance by the means used for restraining the rotation of the said case; and our invention consists in providin g automatically-operated instrumentalities for positioning the thread-holding case during the passage of the upper thread therearound, so that openings between the juxtaposed walls of the said case and its movement-controlling members will be made sufciently large at the proper time for the needle-thread to pass freely through, thus relieving the needle-thread of the labor and strain of making such openings, which labor at a high rate of speed will sometimes overcome the upper tension and cause imperfect stitching (the loop of the upper thread not being drawn up sufficiently) and also cause frequent breaking of the thread.

In the accompanying drawings, illustrating our invention, in the several figures of which like parts are similarly designated, Figure 1 is a front end elevation of a sewing-machine equipped with our improvement; Fig. 2, a section on the line 00 cc of Fig. 1, partly broken away; Figs. 3 and 4, plan views, partly broken away, with the cover-plate, feed mechanism, and bobbin removed, illustrating'the passage of the loop of the upper thread around the thread-holding case; Fig. 5, a perspective view of the thread-holding case as gust 2, 1892.

seen from the under side; Fig. 6, a perspective View of the rotary hook or loop-taker; Fig. 7, a detail perspective view of the threadholding case controlling and restraining member; Fig. 8, a perspective view of the throat-plate as seen from the under side; Fig. 9, a perspective view of the arm for preventing the thread-holding-case actuating member from rotating with the loop-taker; Figs. 10 and 11, views similar to Figs. 3 and 4, but illustrating a modified form of our improvement; and Figs. 12 and 13, perspective views similar to Figs. 5 and 7, but illustrating in detail the modified form of construction shown assembled in Figs. 10 and 11.

In describing our improvement, which we have illustrated in connection with the wellknown Wheeler & Wilson vertical-hook sewing-machine we shall refer to only so much of the sewing-machine as is deemed necessary for a proper understanding of our invention,

and referring to the accompanying drawings, 1 is the bed-plate of the sewing-machine, surmounted by the usual arm 2, within the overhanging end of which is mounted the needlebar 3, presser-bar 4, and take-up 5, all of which may be of the usual or any approved construction.

6 is the loop-taker, carried on the end of a short vertical shaft 7, journaled in suitable bearings 8 beneath the bed.

9 is the thread-holding case, provided with a circumferential flange or rib 10, adapted to fit within an internal annular groove 11 in the loop-taker 6, as shown and described in United States Patent No. 480,181, dated Au- As seen in Figs. 2 to 5, inclusive, the thread-holding case 9 is provided at the upper portion of its rim with a projection 12, adapted to contact with a stop 13, formed asa notch in the under side of the throat-plate 14. (See Fig. 8.) The direction in which the loop-taker 6 rotates is indicated by the arrow in Figs. 3 and 4, and it will be plain that such rotation will exert a tendency through the frictional contact of the thread-holding case with the rotating hook tokeepthe projection 12 pressed against the stop 13.

15 is a spool or bobbin adapted to contain the under thread (not shown) and suitably of said shafts.

secured within the bobbin-case,as by a springlatch 16, (see Fig. 2,) although we do not limit our invention to the use of a bobbin orany special kind of thread-holding case.

17 is a shaft journaled eccentrically within the hook-shaft 7, the lower end of said shaft 17 having attached rigidly thereto an arm 18, to which is pivoted a shoe or slide 19, which moves within a groove 20 in a stationary part of the frame. The upper end of the shaft 17 enters within the circular chamber formed in theloop-taker for the reception of the th readholding case and is equipped with a crank-arm or finger 21, carrying a projection 22, which enters an opening or recess 23, formed within the bottom of the case 9.

24 is a horizontal shaft suitably journaled in bearings 25 (only one shown) beneath'the bed. Said shaft 24 is geared with the upper shaft (not shown) in any suitable or approved manner, so as to revolve in proper time therewith; but we have not illustrated these Wellknown features of the sewing-machine, nor is a further reference thereto deemed necessary, since these features form no part of our present invention.

Rotation is imparted to the hook-shaft 7 through the spiral or worm gears 26 27, fast on the respective shafts 7 and 24; but it will be understood that any other form of gearing would answer the requirements of our in vention in this respect equally well.

The operation of our improvement is as follows: The shaft 17 is held against axial rotation bythe arm 18, and when the shaft 7 is rotated the shaft 17 will be carried bodily through a circular orbit Whose diameter is proportional to the distance between the axes The shoe 19, to which the arm 18 is pivoted, will be reciprocated back and forth in the groove 20, and the finger 21 will be caused to oscillate through an area likewise proportional to the distance between the axes of the shafts '7 17, the pivot 36 on the shoe 19 serving as a center around which such oscillation takes place. The projection 22 on the end of the finger 21 will thus be caused to travel through an elliptical orbit whose major axis is at right angles to the direction of the groove 20. As previously explained, the rotation of the book 6 exerts a tendency to thrust the projection 12 on the thread-holding case against the stop 13 on the underside of the throat-plate, and in order to make a clear passage-way for the loop 27 of the upper thread around the thread-holding case the latter is slightly rotated in the opposite direction, thus Withdrawing the projection 12 away from the stop 13 and permitting the hook to draw the upper part of theloop freely through the opening thus created and cast the same over on top of the thread-holding case, as seen in Fig. 3. This movement of the thread-holding case is effected by the projection 22 contacting with the wall 28 of the opening 23 in the bottom of said case. This position of the parts, as illustrated in Fig. 3, is also favorable for the partial passage of the lower portion of the loop between the finger 21 and the bottom of the thread-holding case, and the continued movement of the hook will draw said lower portion of the loop past the opposite wall 29 of the opening 23 and on top of the finger 21 and projection 22, as will be readily understood by reference to Fig. 3. The take-up now operates to draw the looped thread off the hook and case to complete and tighten the stitch. The finger21 in the meanwhile moving away from the wall 28 permits the projection 12 to come into contact with the stop 13, and a further movement of the projection 22 effects a clear passage-way for the thread to Withdraw out of the loop-taker and from beneath the thread-holding or bobbin case, as will be readily understood by reference to Fig. 4. When the finger 21 moves away from the wall 28, formed by the recess 23, the frictional contact between the revolving hook and bobbin-case will cause the latter to move with the hook until the projection 12 on the bobbin-case abuts against the stop 13 on the under side of the throat-plate, whereby such motion of the bobbin-case will be arrested and the same held stationary until moved by said finger in the opposite direction to permit the introduction of the loop, as previously described. 7

The modified construction shown in Figs. 10 to 13, inclusive,-is similar in all respects to our preferred construction except that the stationary stop on the under side of the throatplate to restrain the bobbin-case against rotation with the hook is omitted and the finger 21 is extended across the rod and has two projections 22 and 30, adapted to work, respectively, in the two recesses 23 and 31, formed in the bottom of the threadholding case. Fig. 10 shows the position of the parts as the loop is cast over the bobbin and is about to pass between the walls 29 and 32 of the recesses 23 and 31 on top of the finger 21 and its projections 22 and 30, and Fig. 11 shows the position of parts as the loop is being withdrawn from beneath the bobbin-case and out of theloop-taker by the take-up to complete the stitch. The passage-ways for the thread are first made at one side by the projections 22 and 30 moving from the respective walls 29 and 32 as the loop is drawn around the bobbin, the passage-ways to permit the withdrawal of the loop by the take-up being made by the projections 22 and 30 moving in the opposite direction and away from the walls 28 and 33, respectively, as will be readily understood by reference to Fig. 11. As shown in Fig. 10, the bobbin-case is restrained against turning with the hook by the projection 22, while in Fig. 11 said case is restrained against turning bythe projection 30, and it will be readily understood that as the hook-shaft revolves, imparting motion to the finger 21, as previously described, either one or the other of said projections 22 and 30 will always be in contact with the bobbin-case, and although the latter will not remain absolutely stationary, owing to the peculiar movement of the finger2l, still such oscillation as the bobbincase receives is not harmful to the stitching, but rather facilitates the making of the passage-ways for the loops of thread.

What we claim is- 1. In a sewing-machine, a stitch-forming mechanism including a loop-taker about which the needle-thread is cast, a thread-holding case peripherally journaled in said looptaker, and means to rotate the loop-taker, combined with means interposed between the loop-taker and the thread-holding case and devices to control the movement of such interposed means independently of the looptaker, to rotate the case in a direction opposite to the rotation of the loop-taker, to provide openings for the passage of the needlethread around the thread-holding case, substantially as described.

2. In a sewing-machine, a stitch-forming mechanism including a thread-holding case, and a loop-taker within which the said case is peripherally journaled and capable of a reverse rotation, in combination with means including an arm provided with a projection adapted to coact with said thread-holding case to reverse its rotation and to provide openings for the passage of the upper or needle thread, substantially as described.

3. In a sewing-machine, the combination in a stitch-forming mechanism, of a looptaker, a thread -holding case peripherally journaled in said loop-taker, a case-impelling mechanism interposed between the loop-taker and case, and means for actuating said looptaker whereby the actuation of said looptaker effects, through such case-impelling mechanism, an opening for the passage of the upper or needle thread around the threadholding case, substantially as described.

at. In a sewing-machine, a stitch-forming mechanism including a thread-holding case having a peripheral flange, and a loop-taker having a groove to receive such flange, combined with a projection engaging coacting walls in the case, to compel movements of the thread-holding case in opposite directions for effecting suitable openings for the passage of the needle-thread around the threadholding case, substantially as described.

5. In a sewing-machine, a stitch-forming mechanism including a thread-holding case and rotating loop-taker in which the case is peripherally journaled, said loop-taker provided with coacting means, including an arm provided with an eccentric projection and interposed between said rotating loop-taker and thread-holding case and engaging said case, whereby the rotation of said loop-taker effects suitable openings between said threadholding case and loop-taker for the passage of the needle-thread, substantially as described.

6. In a sewing-machine, the following in strumentalities in combination: a stitch-forming mechanism employin'ga rotary loop-taker and shaft, a thread-holding case peripherally jonrnaled in said loop-taker, and a rod arranged eccentrically in the loop-taker shaft and provided with an arm having a projection engaging the threadholding case, to compel a predetermined coaction of looptaker and thread-holding case to permit a free passage of the needle thread around said thread-holding case, substantially as described.

7. In a sewing-machine, a stitch-forming mechanism, comprising a rotary loop-taker, a thread-holding case mounted therein, and provided with an opening in its base, a rod arranged eccentrically relatively to the looptaker shaft and means to oscillate said rod, the said oscillating rod having a projection engaging the walls of said opening and of smaller dimensions than said opening, substantially as described.

8. In a sewing-machine, a stitch-forming mechanism including a loop-taker, a threadholding case arranged therein, and provided with an opening in its base, and also provided with a lateral projection adapted to engage a stationary portion of the machine, combined with a rod arranged eccentrioally relatively to the loop-taker shaft and means to oscillate said rod, the said oscillating rod provided with a projection entering said opening and movable from one side to the other thereof, substantially as and for the purpose described.

9. In a sewing-machine, a stitch-forming mechanism including a loop-taker, a shaft upon which it is mounted, means to rotate said shaft, a thread-holding case mounted in said loop-taker and having an opening in its base, means to control the direction of movement of the case including a rod arranged eccentrically with relation to the loop-taker shaft and having a projection entering the opening in the base of the case, and means to prevent the independent rotation of said rod, substantially as described.

10. In a sewing-machine, the following instrumentalities in combination: a needle, a needle-carrier, a rotating loop-taker, having movably secured therein a thread case, a thread loop controlling mechanism interposed between said case and the frame of the machine, comprising a rod eccentrically mounted in the loop-taker shaft and provided with a projection which coacts with a suitable opening in the thread-case, for the purpose specified, substantially as described.

11. In a sewing-machine, a stitch-forming mechanism, comprising a loop taker, and means to impart the requisite motion thereto, a thread-holding case mounted in said looptaker, a lateral projection from the upper portion thereof, a throat-plate provided with a stop-notch with which said projection cooperates to limit the movement of the case in one direction, and means to compel the movement of the case in the opposite direction, substantially as described.

12. In a sewing machine, a stitch-forming mechanism, comprising a loop-taker, means to impart the requisite motion thereto, a thread-holding case mounted in said looptaker, alateral projection from the upper portion thereof, a throat-plate provided with a stop-notch with which said projection cooperates to limit the movement of the case in one direction, the said case provided with an opening in its base, combined with a rod ar- 

